Redox Reactions – Class 10 Science
Definition of Redox Reaction
A reaction in which oxidation and reduction occur simultaneously is called a redox reaction.
- Oxidation: The process of losing electrons or gaining oxygen.
- Reduction: The process of gaining electrons or losing oxygen.
Examples of Redox Reactions
- Reaction of Copper Oxide with Hydrogen
CuO + H_2 \rightarrow Cu + H_2O
- Hydrogen (H₂) is oxidized to water (H₂O).
- Rusting of Iron
4Fe + 3O_2 + 6H_2O \rightarrow 4Fe(OH)_3
- Oxygen (O₂) gets reduced to hydroxide ions.
- Reaction Between Zinc and Copper Sulfate
Zn + CuSO_4 \rightarrow ZnSO_4 + Cu
- Copper ion (Cu²⁺) is reduced to copper (Cu).
Concept of Oxidizing and Reducing Agents
- Oxidizing Agent: The substance that gains electrons and gets reduced.
- Reducing Agent: The substance that loses electrons and gets oxidized.
Identification of Redox Reactions
A reaction is a redox reaction if:
- There is a change in oxidation states of elements.
- Electrons are transferred from one species to another.
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